A company's culture should let the most junior person overrule the most senior one with data, which is why the senior person should always speak last.

Yes, and that's true inside companies too. And so you want to set up your culture so that the most junior person can overrule the most senior person if they have data. And that really is about trying to... There are little things you can do. So for example, in every meeting that I attend, I always speak last.